What will the client see if the device is not working?

If the device is not working, the customer usually sees an error message or notification informing about the problem. Depending on the implementation, this could be:

• A message on the screen explaining that the device is temporarily unavailable.
• Error indication through light or sound signals.
• In the application interface — a notification or warning.

It is important that the message is understandable and provides recommendations for further actions, such as trying again later or contacting support. This improves user experience and reduces frustration.